A vessel contains $60 \text{ litres}$ of a solution of acid and water in which acid is $80\%$. How much water must be added to this solution so that the percentage of acid becomes $60\%$?

Options:

• A: $12 \text{ litres}$
• B: $15 \text{ litres}$
• C: $20 \text{ litres}$
• D: $25 \text{ litres}$

Related Practice Questions:

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